Table of contents | Table of diagrams Joseki Related joseki Mutual good shape Black to play Good empty triangle Bad empty triangle |
Efficiency is one aspect of shape. Late in the game, especially, it can be obviously correct to make an empty triangle and making an empty triangle can also be the vital point.
is the vital point, even though it is an empty triangle.
makes "good shape" but becomes overconcentrated.
unkx80: I don't think it's so much about overconcentration. I believe that it's got more to do with destroying White's eye shape.
Bill: Well, it is a question of emphasis, isn't it? Anyway, let's take away the stone.
This is fine for both players, no? Black does not need an extra stone.
This problem comes from the Tesuji Dictionary, by Segoe Kensaku and Go Seigen. They say that if you get this one right, you are 5 dan. (Of course, you have a big hint. ;-))
The sequence of to
is one of the best ways of escaping with the lone white stone at the top.
makes the empty triangle and then White has a rather clear exit, while aiming for the cutting point at a (at the correct time).
here would be a mistake.
plays at the vital point, destroying White's eye shape, and forcing
to connect with a bad empty triangle.
Cruncher: isn't this a Guzumi? I stumbled upon these pages, but they do not reference each other...
Tamsin: You're right, Example 3 is certainly a guzumi. I'm not sure if guzumi refers to all good empty triangles or only the specific shape in Example 3, though. According to the discussion on guzumi, it may be a general term for makeshifts, but that discussion is not conclusive.